Central Bureau for Astronomical Telegrams
IAUC 8567: 2005cw; AS 325; TIME ADJUSTMENT ON 2005 Dec. 31
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Circular No. 8567
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2005cw IN IC 1439
Y.-T. Chen, Graduate Institute of Astronomy, National Central
University; together with T.-W. Chen and Z.-Y. Lin, report the
discovery of an apparent supernova (mag about 18.5) on unfiltered
CCD images taken on July 11.853 UT with the 1-m Lulin Observatory
telescope in the course of the Taiwan Supernova Survey; the new
object was confirmed at mag approximately 18.1 on an image taken on
July 12.651. SN 2005cw is located at R.A. = 22h16m40s.14, Decl. =
-21o29'08".9 (equinox 2000.0), which is 5".6 west and 20".5 south
of the center of IC 1439. Nothing was visible at this location on
an image taken on 2004 Dec. 14.510 (limiting magnitude about 18.6).
AS 325
S. Otero, Buenos Aires, Argentina, reports that AS 325, an
eclipsing binary (period 513 days), has entered a rapid decline
phase and is currently near mid-eclipse; the current eclipse
started on June 5, and eclipses last about 86 days. AS 325 is
presently at V = 12.0, or 2 mag fainter then prior to eclipse, and
over 1 mag fainter than during previous eclipses (IBVS 5608;
http://www.astrouw.edu.pl/cgi-asas/asas_lc/185004-2624.3).
S. Howell, WIYN Observatory, reports that spectra obtained during
June 28-July 2 reveal that the H emission is weaker by 50 percent,
while the Fe II emission remains constant, and the previously
strong Ca II H and K absorption is nearly absent (Cool et al. 2005,
PASP 117, 462). Spectra from July 1 show a slightly increasing
blue continuum mainly consisting of emission lines and obvious TiO
absorption in the red. Mid-eclipse is expected for July 18, and
multicolor observations and additional spectra are needed to
confirm that the cool component is the one that is being eclipsed.
The Tycho Reference Catalogue (via SIMBAD) lists the position of AS
325 as R.A. = 18h50m03s.57, Decl. = -26o24'15".4 (equinox 2000.0).
TIME ADJUSTMENT ON 2005 DECEMBER 31
Bulletin C30 of the International Earth Rotation and Reference
Systems Service announces that a positive leap second will be
introduced such that the sequence of UTC second markers will be:
2005 Dec. 31d23h59m59s, 31d23h59m60s, 2006 Jan. 1d00h00m00s.
Beginning 2006 Jan. 1, the difference UTC-TAI = -33 s (UTC-TAI has
been -32 s since 1999 Jan. 1).
(C) Copyright 2005 CBAT
2005 July 13 (8567) Daniel W. E. Green
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